package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /*
    * 查看购物车*/
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    @Override
    public void cleanShopingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
     //判断当前加入到购物车中的商品是否已经存在了

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需要将数量加一
        if(list != null && list.size() > 0)
        {
            //最多查到一条 或者没有
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1); // 更行 shopping_cart set Number = ? where id = ?
            shoppingCartMapper.updateNumerById(cart);
        }
        else
        {
            //如果不存在， 需要插入如一条购物车数据

            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            //如果当前菜品id不是空格
            if(dishId != null)
            {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

                //因为是第一次添加 所以数量是1
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCartMapper.list(shoppingCart);
            }
            else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

                //因为是第一次添加 所以数量是1
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());

            }
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /*
    * 删除购物车中的一条数据*/
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询调价，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0)
        {
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();

            if(number  == 1)
            {
                //当前商品在购物车中的分数为1 直接删除数据
                shoppingCartMapper.deleteByID(shoppingCart.getId());
            }
            else{
                //当前商品在购物车中的分数 部位 1
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumerById(shoppingCart);
            }
        }
    }
}
